Don't go directly to Bone Crackers pit as posted below unless you know the way::
If you head straight to bonecrackers pit while down in the ravine, you will get stuck and have to turn around and start over.
Head to Slavedriver Menlo's cave, stay up on the wall at all times...don't go into the ravine. Just before Slavedriver Menlo's fort cross the bridge headed to Bonecracker and stay up on the ledge. Then follow the directions below posted by wagiet.